CA
- Cellulose Acetate
CAB
- Cellulose Acetate Butyrate
CAP
- Cellulose Acetate Proprionate
CN
- Cellulose Nitrate (celluloid)
COC
- Cycloolefin Copolymer
COP
- Copolyester Thermoplastic Elastomer
CPE
- Chlorinated Polyethylene
CPVC
- Chlorinated Polyvinyl Chloride
CTA
- Cellulose Triacetate
CTFE
- Chlorotrifluoroethylene